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A survey found that out of 200 workers, 168 said they were interrupted three or more times by phone messages, faxes, etc.
A. Find the 90% confidence interval for the population proportion of workers who get interrupted three or more times.
B. What sample size is required to estimate the proportion to within 2% of the population proportion, with 99% confidence, if a previous study gave an estimate of 80%?
Gold's managers are considering a promotion in which they reward frequent users with a small gift. They have decided that they will only give gifts.
For each of the findings outlined below, state (i) the independent variable or variables, and their levels where appropriate, (ii) the dependent variable(s), and (iii) what category of research design is being used:
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You take a random survey of 20 students and their ACT scores are: {26,22,23,12,19,25,23,21,25,10,17,26,23,24,20,14,21,23,20,22} If you know the test scores are normally distributed. What is the confidence interval at 95%?
Consider the Markov chain whose state at any time is the vector (n1, ... , nm) where ni denotes the number of balls in urn i. Guess at the limiting probabilities for this Markov chain and then verify your guess and show at the same time that the M..
the correlation coefficient r between two variables x and y is -0.9. how much of the variation in the variable y is
In order to estimate the speaking vocabulary of three-year-old children in a particular socioeconomic class, a sociologist studies the speech of four children.
For each of the 50 states and Washington, D.C., a number of statistics related to education are available for 1992
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